The Christmas Invasion marks the beginning of David Tennant's tenure as the Tenth Doctor, following the departure of Christopher Eccleston's Ninth Doctor. As Christmas Eve falls on a cold and snowy London, the Doctor arrives just in time to prevent an alien invasion led by the Sycorax. With the help of Rose Tyler (Billie Piper) and Mickey Smith (Noel Clarke), the Doctor must thwart the Sycorax's plan to take over Earth.

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